Phosphorescent or luminous masses or compounds



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may moureeun MINES, or nrviznroon, ENGLAND risosrfion nscnnr on Luminous MASSES on comrounns E's Drawing. Application filed December 20, i930, serial No. 503,857, and iii Great Britain October 18, 1929.

This invention relates to phosphorescent or luminous masses or compounds and 1s especially characterized in that the finished phosphorescent or luminous mass or compound is 5 in a state sufficiently finely divided for incorporation without grindingwhich is known to injure the luminous properties of phosphorescent compositions- 1n any suitable medium adapted to act as apaint-forming carrier, without loss of phosphorescent properties. r

A phosphorescent or luminous mass or compound, according to my invention, includes base compositions or materials (here- 'inafter for convenience of reference, designated bases) consisting of Base, A

43400 parts by weight strontium carbonate. 10850 parts by weight calcium carbonate.

2170 parts by weight magnesium carbonate.

Base B 1085 parts by weight lithium carbonate.

542% parts by weight rubidium carbonate. 54256 parts by weight aluminium silicate.

hwmximatelrgn i Base C I 227854 parts by w ht suitable carbonaceous matter (such es s tarch).

Base D 683536 parts by weight sulphur.

Base E p 3% by weight 01 one or more substances L ereinaiter referred to as "phosphorogens I scribed.

It is to be stated that a phosphorogen is a rare earth or heavy metal in the form of a readily soluble salt, which, when introduced as an'lmpurityinto Bases'A, B, C and D ina finely divided state, may be considered to be directly responsible for the phenomenon of phosphorescence. It acts in some manner as a light emission centre. A luminophore may be any suitable readily soluble metallic salt which, by acting as'a flux, will convey the phosphorogens throughout th entire compound when subjected to heat treatment.

It is assumed that the phosphorogens, in combination with the luminophores, are responsible for the colour of the phosphorescent light which luminous masses are capable of emitting.

According to the rocess of manufacture:

The ingredients 0 Base A are purified by the usual chemical processes, thoroughly drled, placed in an oxidizing furnace and heatedv to form a compound oxide which is allowed to cool and is then ground .as finely as possible, preferably in a porcelain mill or a paint grinding machine, fitted with porphyry rollers.

Saidcompound oxide is now thoroughly incorporated with Bases B, C, D and E, to-

gether with a luminophore or luminophores (to produce the particular colour of phosphorescence required), and the mixture is heated in a non-oxidizing furnace at and for desired temperature and timesee l examples hereinafter. p a The mixture, after cooling, isagain' ground as finely as possible and re-heated in the presence of a current of dry hydrogen.

.The luminous mass or compound when cool-remains in a finely divided state, and

may, if desired (and without grinding) bemixed with finely pulverized resins, such as copal, dammar, or the like, to which are added suitable solvents in suflicient quantity to act as a carrier for the purpose of produc- Y ing luminous paint or it may be mlxed with carriers such as solutions of nitrocellulose or cellulose acetate or their derlvatlves to produce a paint. For the purpose of producing aflat enamel paint of high-covering value the Appmflmately 1302 parts by weight Example! For the production of a luminous mass giving a violet phosphorescent light Ba'ee'A Base B Base C Base D Approximately 1085 parltisdby weight sodium chloe. 1085 parts by weight potassium chlor e.

434 parts by weight manganese chloride 1 part by weight thorium nitrate phosphorogens' )4; parts by weight bismuth nitrate} (Base E.)

Heated for 30 to 90 minutes at temperature of about 1250 C.

Emu/mph 2 lumlnophores For production of luminous mass giving blue phosphorescent light Base A Base B Base C ma 1 Base D te y 1302 parts b weight sodium sulphate 1302 purget y weight potassium sulluminophores p a e.

1 part by weight thorium nitrate z g 214 parts by weight bismuth nitrate 'f E) Heated for 30 to 90 minutes at temperature of about 650 C.

Example 3 For production of luminous mass giving indigo phosphorescent light Base A Base B Approximately 1085 parts by weight sodium hyposulphate 1085 parts by'weight potassium bi-chromete lumino 434 parts by weight calcium fluoride phores 1 part by weight thorium nitrate g g 2% parts by weight bismuth nitrate 03836 E),

Heated for 30 to 90 minutes at temperature of from about 500 C. to about 600 C.

' Ewample 4 For production 0t luminous mass giving green phosphorescent light Base A Base B Base C Base D barium sulphate lumino-' 1302 parts by weight sodium sulphate phores phosphoro gens (Base E) 1 part by weight thorium nitrate 2% parts by weight thallium nitrate menses Heated for 30 to 90 minutes at temperature of from about 750 C. to 800 C.

Ewample 5 For production of luminous mass giving yellow phosphorescent light Base A Base B Base C A imtel 085 8112b ight d hl pprox a yl p s ywe iumc oride 1085 parts by wei t sodium carbonate F gi? 434 parts by wei t manganese chloride p m 1 art by weight thorium nitrate gg 2% parts by weight erbium nitrate E) Heated for 30 to 90 minutes at temperature of about 750 C.

Ewample 6' For production of luminous mass giving orange phosphorescent light Base A Base B Base C Base D 1085 parts by weight sodium chloride 1085 parts by weight potassium chloride lumino- 217 parts by wei ht manganese chloride phores 217 parts by weig t barium sulphate 1 part by weight thorium nitrate 2% parts by weight rubidium nitrate Approximately Phosphorosens (Base E) Heated for 30 to 90 minutes at temperature of about 1300 C.

Ewample 7' For production of luminou mass giving red phosphorescent light Base A Base B Base C h Base 13 1035 parts by wei t sodium uoride Approximately 434 parts by weig t manganese sulphate lumino- 54256 parts by weight rubidium su phate phoree 542% parts by weight barium sulphate 1 part by weight thorium nitrate 1 part by weight nickel sulphate gens 1% parts by weight silver nitrate (Base E) Heated for 30 to 90 minutes at temperature of about 800 C.

Where practicable, said-phosphorogens are preferably introduced in the form of alcholic solutions. 4

It will be understood that colours other than said spectrum colours may also be pro duced by varying combinations of phosphorogens and luminophores or/and by varying the temperatures and time periods of furnacing.

What I claim as my invention and desire to secure by Letters Patent is The manufacture or production of a phosphorescent or luminous mass 01'' compound, by heating strontium carbonate, calcium carbonate and magnesium carbonate in an oxidizing .furnace; grinding the compound oxide so formed and incorporating the same with lithium carbonate, rubidium carbonate, alummlum sillcate, carbonaceous matter, sulphur, one or more phosphorogens and one or memes? more lumiqophoresfhedting; the in drogen. e In ogy whereof my signature WHEY ONTAGUE z-FIEIT: 

